especially in the isekai and fantasy romance niches. The portrayal can vary wildly from a terrifying antagonist to a morally grey love interest. One that immediately comes to mind is 'The Demon King's Daughter is a Saint?' where Mikaela is a central figure, though more as a background force driving the heroine's conflict. Another is the web serial 'Contract with a Fallen Archangel,' but fair warning, the translation quality is a real mixed bag.
Honestly, the name seems to pop up most in works that blend Christian-esque angel/demon hierarchies with game-like systems. You'll find a 'Mikaela' often positioned as a high-ranking demon lord or a fallen angel, sometimes holding a key to the protagonist's power or curse. The specific character depth really depends on the author; some treat the name as just a cool title, while others build a whole tragic backstory around it. My advice? Searching novelupdates with the tag 'Demon' and the name usually surfaces the relevant ones, though you might have to wade through some MTL dreck.